Centrifugal pump



R. N. TRANE.

CENTRIFUGAL PUMP.

APPLICATION FILED JAN-4| 1919.

Patented May 11, 1920.

HEETSSHEET I- W REUBEN N.

VENT 0H Fwy/vs.

WITNESSES a JAZZCZQ A TTORIVEYS R. N. TRANE.

CENTRIFUGAL PUMP.

APPLICATION FILED JAN-4,1919.

Patented May 11,1920.

2 SHEETSSHEET 2.

INVENTOI? REUBEN N. 77mm:

WITNESSES Mim G Q KmZ /ATL/ ATTORNEYS UNITED srA'rEs PATENT OFFICE.

REUBEN N." TRANE, OF LA CROSSE, WISCONSIN.

CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented May 11, 1920.

Application filed January 4., 1919. Serial No. 269,558.

pumps and has for an object the provision of an improved construction wherein the water is acted on at two stages before it is discharged from the pump.

Another object in view is to provide. a construction wherein the impeller of the pump will act on the water or other liquid being pumped in the proper manner when same is at a low speed, and will later act on the same water when at a high speed for increasing in a regularmanner said speed.

A further object, more specifically, is the provision of a pump having an inner chamber and an "outer chamber with a passageway therebetween and an impeller formed with impelling means acting on the water in the inner chamber for forcing same out said passageway, and impelling means for acting on the water in the outer chamber for increasing the speed of the water after it leaves said passageway.

In-the accompanying drawings:

Figure 1 is a longitudinal vertical section through a pump disclosing an embodiment of the invention, being through Fig. 3 on line 1-1.

Fig. 2 is a view similar to Fig. 1, but with the impeller and associate parts removed. I

. Fig. 3 is a sectional view through Fig. on line 3-3.

Fig. 4: is a sectional view similar to Fig. 3,

but with the impeller and the side plate re moved.

Fig. 5 is a sectional View similar to Fig. 4, but disclosing the side plate. K

Referring to the accompanying drawings by numerals 1 indicates a foundation of any desired kind, preferably cast integral with the casing 2. Casing 2 is provided with a number of threaded apertures 3 for receiving bolts 4. whereby the face plate -5 may be bolted firmly in place. It will, of course, be evident that the apertures 3 could extend all the way through the casing and bolts or other means provided instead of the screws 4; without departing from the spirit of the invention. In fact the plate 5 could be secured in any desired way, the essential feature being a movable strugture whereby the impeller 6 may be applied and removed at any time. The impeller 6 isformed with a hub 7 a plurality of curved impelling blades 8, a solid. bearing section 9, and a plurality of peripheral blades 10. These different blades maybe made in a varietyof ways, one desirable way being a spirally arranged blade as-shown in Fig. 1, said bladesj being preferably fiat and larger at ,the hub than where they join the bearing section 9 as indicated in Fig. 3. This structure is desirable as the water or other liquid being pumped will enter the inlet 11 at a comparatively slow speed and the large end of the blades 8 adjacent the hub will have an opportunity to increase the speed of a large volume of water so as to cause the outer part of the blades 8 to act in a more efiicient manner. The impeller 6 is, arranged within the casing 2 in such a manner that the hub and blades 8 will be positioned in the inner or intake chamber 12 forming the first stage, while the blades 10 will be arranged in the outlet or outer chamber, forming the second stage, 13. From Fig. 3 it will be observed that the contour of the chamber 12 is more or less irregular in order that there will be space for water or other liquid at each side of the blades while the casing 2 is formed. with an annular extension 14 acting as one bearing member for the section 9 of the impeller, while the plate 5 is provided with an annular extension 15 acting as an opposite bearing. The annular bearing members 14 and 15 are cut away at 16 (Figs. 1 and 2), whereby the liquid will flow in the direction of the arrows shown in Fig. 1 when the device is in operation.

chamber is an abutment 17, which is ad-' justably mounted in the notch 18', the same being held in place by the pressure of wa-i ter against the walls of the notch and by the threaded member 19 which is locked in any adjusted position by the nut 20. When it is desired to secure a maximum pressure from the pump the abutment 17 is adjusted until it almost touches the blades 10 whereby the water is discharged out the outlet in casing 22 at the high pressure desired. By adjusting the abutment 17 so as to allow a considerable space between the abutment and the blades 10 a less pressure will be delivered, as some of the liquid will follow the blades past the abutment back into the chamber 13. It will be noted that the water enters the pump at the inlet Y11 and finallyleaves the pump at the outlet or discharge port 21 In passing through the pump the water passes through two stages, namely, the first stage where it is operated on by the blades 8 and where the speed of the liquid is materially increased before it is discharged into the chamber 13 and then is acted upon at the second stage in the chamber 13 for further increasing the speed of the liquid before it is finally discharged out the opening or port 21. T his double action produces a two stage operation on the liquid by a single impeller. In connection with the chamber 13 it will'be, of course, evident that this chamber may be any desired shape in cross section, but is preferably round in cross section as shown in Fig. 3. The pump is, of course, preferably driven at a certain desired speed and when so driven it sometimes produces more or less pressure than desired, and to rectify the slight difference in pressure an adjustment of the threaded member 19 will produce the desired results. The adjustment of this member will actuate the abutment 17 and when the abutment is moved in one direction greater pressure will be produced and when moved in the opposite direction a less pressure by reason of the loss or gain by allowing more or less of the liquid to pass the abutment back into the chamber 13. p f i What I claimisi 1. Ina rotary pump, a rotor, the marginal portion of the periphery of which is provided with a series of radialblades acting as propelling vanes, a bearing or peripheral member arranged at the base of said blades, a hub, and a plurality of primary impelling blades extending from the hub to the periphery or bearing member. I

2. In a rotary pump, a rotor provided with a hub, a peripheral bearing member, a primary set of impelling blades arranged between the hub and the bearing member,

and a secondary 'set of impelling blades radiating from the periphery of the bearing member.

3. In a rotary pump for pumping liquid, a casing provided with; inner and outer chambers, an inlet for the inner chamber,

and outlet for the outer chamber, a single passageway between said chambers near said outlet, a single impeller for said liquid having a plurality of large blades arranged in the inner chamber, .small blades arranged in the outer chamber, the liquid being forced by the larger blades through the opening into the outer chamber. and by the smaller blades through the outlet opening.

4. A rotary pump comprising a casing, a rotor disposed within the casing, said rotor having a hub and a concentric bearing portion arranged to engage a portion of the casing, blades extending from said hub-to said bearing portion, a second set of blades radiating from the periphery of said'bearing portion, said bearing portion having a passage for permitting the flow of liquid from' the first named set of blades to the second named set.

5, A rotary pump comprising a casing, an impeller having a bearing portion arranged to engage projections on the opposed walls of the casing, whereby an outer passageway is formed, blades projecting outwardly from said bearing portion into said passage, and an abutment carried by the casing immediately adjacent to the ends of a plurality of said blades, whereby a flow of fluid between the bearing member and the abutment is prevented.

6. A rotary pump comprising a casing, an impeller having a bearing portion arranged to engage projections on the opposed walls of the casing, whereby an outer passageway is formed, blades projecting outwardly from said bearing portionvinto said passage, and an abutment carried by the casing immediately adjacent to the ends of a plurality of said blades, whereby a flow of fluid between the bearing member and the abutment is. prevented, said abutment being adjustable toward and away from the ends of said blades.

7. In a rotary pump, a casing having a passageway extending circumferentially from a suitable inlet to a suitable outlet, a

second passageway extending from saidoutlet circumferentia-lly to a discharge port,

ing blades extending from the hub, said blades tapering from the hub so that the outer end will be appreciably smaller than the hub end, a bearing member arranged at the outer end of said blades, said bearing member actingas a partitioning wall between the first mentioned circumferential passageway and the second mentioned circumferential passageway, and a plurality of vanes arranged on the periphery of the bearing member extending into the second mentioned peripheral passageway.

8. In a rotary pump a casing having a passageway extending circumferentially from a suitable inlet to a suitable outlet, a second passageway extending from said outlet ,circumferentially to a discharge port, a single impeller arranged in the casing provided with a hub and radiating blades ex tending from the hub, a bearing member arranged at the outer end of said blades,

said bearing member acting. as parti-.

,cumferential passageway and the second mentioned circumferential passageway, and a plurality of vanes arranged on the periphcry of said bearing member extending into the second mentioned peripheral passageg In a rotary pump, a casing having a central chamber provided with a central inlet therefor, a circumferential outer chamber spaced from the inner chamber, said casing having a pair of annular bearing surfaces between said central chamber and said outer chamber, a passageway between said chambers arranged in said annular bearing surfaces, and a single impeller provided with an inner set of blades and an outer set of blades and a bearing section coacting with said annular bearing surfaces for separating said chambers, said inner set of blades being arranged in said inner chamber and said outer set of blades being arranged in the outer chamber whereby when the impeller is rotated liquid will be drawn into the inner chamber and forced into the outer chamber through said passageway, and the 25 liquid in the outer chamber will be moved by the blades therein to a discharge outlet.

REUBEN N. 'TRANE. 

